I agree on the usefulness of vets if a chicken is in trouble in many cases too.This is a very hard message to get accross to people and even more difficult on a largely American forum where many have the expecation that we can fix things and are relatively new to chicken keeping. I mean no disrespect, but after a few years of struggling to keep a sick chicken alive, only to have it die a few weeks after you think you've dealt with the problem your attitude is likely to change.
External injuries I found are different, possibly because they are often easier to identfy and how to treat them is fairly well understood. I've had some very hostile reactions when I've suggested, particularly with sick chicks, that putting the chick out of it's misery as quickly as possible would be my approach.
Before joining BYC actively I was on a Dutch chicken forum. I learnt a lot from experts on that forum about keeping/ dealing with chickens. But I didn't agree on spending much money on vets/antibiotics for chickens with a respiratory or an internal problem.
It seemed the vets often subscribed antibiotics without knowing the cause of the health problem. Sometimes the chickens healed, sometimes they didn’t ’. And the ones that healed after being in a bad state often died a month later. I believe antibiotics kill the good bacteria too, and make the chickens vulnarable for all kind of diseases after a while.
My story. The year after I started with chickens I had sneezing chicks. Most people on this forum told me to go to a vet for antibiotics. One person said, don’t if you want a strong flock. I followed the last advice. All chicks survived. After a few weeks they got better. One chick needed 6 weeks to recover. these chicks never got sick. And I still have 2 of them today. 7 years old.
Last year these oldies (black Dutch ) hatched a few eggs (bantam RIR) for maintenance.